Ubuntu Security Notice USN-885-1 January 14, 2010
It was discovered that the Transmission web interface was vulnerable to cross-site request forgery (CSRF) attacks. If a user were tricked into opening a specially crafted web page in a browser while Transmission was running, an attacker could trigger commands in Transmission. This issue affected Ubuntu 9.04. (CVE-2009-1757)
Dan Rosenberg discovered that Transmission did not properly perform input validation when processing torrent files. If a user were tricked into opening a crafted torrent file, an attacker could overwrite files via directory traversal. (CVE-2010-0012)
The problem can be corrected by upgrading your system to the following package versions:
Ubuntu 8.04 LTS:
After a standard system upgrade you need to restart Transmission to effect the necessary changes.